Noise Filter Magnetic Coupling Reduces Parasitic Inductance
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Solution Overview
Problem
Existing noise filters with conductive lines formed in specific patterns face limitations in design versatility due to increased parasitic inductance and heat radiation issues, leading to suboptimal filtering performance, especially in high-frequency bands.
Innovation Solution
A noise filter design incorporating a first and second conductive line with a magnetic body that magnetically couples the lines, reducing equivalent series inductance and parasitic inductance by adjusting mutual inductance, allowing for various conductive line configurations and improved heat radiation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitor is connected to a conductive line to filter electromagnetic noise, then the filtering function is provided, but the parasitic inductance of the capacitor and conductive line degrades the filtering performance in high-frequency band
Solution Approach 1:
A magnetic coupling component is introduced as an intermediary between the input and output conductive lines. This component provides magnetic coupling that generates mutual inductance, which acts to cancel the parasitic inductance effects in the filtering circuit, thereby improving high-frequency filtering performance without requiring changes to the capacitor or conductive line geometry
Solution Approach 2:
The invention changes the electrical parameters of the filtering circuit by introducing magnetic coupling with adjustable mutual inductance. By adjusting the coupling coefficient and mutual inductance value, the equivalent series inductance of the capacitor is reduced, transforming the filtering characteristics to achieve better high-frequency performance
2Reliability
If a conductive line is formed in a specific pattern to create magnetically coupled inductors, then the filtering performance is improved, but the design versatility is reduced and the conductive line width is narrowed
Solution Approach 1:
The magnetic coupling component is divided into separate first and second magnetic coupling portions that can be independently positioned and adjusted. This segmentation allows the conductive lines to maintain standard widths and follow flexible routing patterns while still achieving the desired magnetic coupling effect, thereby preserving design versatility
Solution Approach 2:
Instead of forming inductors directly from conductive lines in specific patterns, the invention uses a separate magnetic coupling component as an intermediary to provide the necessary magnetic coupling. This approach decouples the filtering performance requirement from the conductive line geometry, allowing standard conductive line patterns to be used
3Reliability
If the conductive line width is narrowed to achieve specific pattern configuration, then the magnetic coupling is enhanced, but the heat radiation capability is reduced and parasitic resistance increases
Solution Approach 1:
The magnetic coupling component serves as an intermediary that provides strong magnetic coupling without requiring narrow conductive lines. The magnetic coupling portions are positioned to maximize coupling efficiency while the conductive lines maintain sufficient width for adequate heat radiation and low parasitic resistance
Solution Approach 2:
The magnetic coupling is achieved by utilizing spatial positioning of magnetic coupling portions in three-dimensional space rather than relying on narrow conductive line widths. The first and second magnetic coupling portions are arranged to provide optimal magnetic flux linkage while allowing the conductive lines to maintain standard dimensions for thermal management
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances filtering performance for electromagnetic noise in high-frequency bands while offering high design versatility and reduced energy loss, without the need for specific conductive line patterns.
Implementation Method 1
The first magnetic body is configured to magnetically couple the input-side conductive line to the output-side conductive line such that at least an equivalent series inductance of the capacitor and a parasitic inductance of the second conductive line are reduced by a mutual inductance between the input-side conductive line and the output-side conductive line
Data Source
AI summary
A noise filter may include: a first conductive line extending between an input and an output terminal portion, wherein the first conductive line includes an input-side conductive line extending between the input terminal portion and a branch portion, and an output-side conductive line extending between the output terminal portion and the branch portion; a second conductive line connected to the branch portion of the first conductive line, wherein a capacitor is on the second conductive line; and a magnetic body surrounding at least a part of a circumference of at least a part of the first conductive line, wherein the magnetic body is configured to magnetically couple the input-side and the output-side conductive lines such that at least an equivalent series inductance of the capacitor and a parasitic inductance of the second conductive line are reduced by a mutual inductance between the input-side conductive line and the output-side conductive line.